Desk lamp



FIG. 1 is a front elevation view of the desk lamp showing my new design;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a top elevation view thereof;

FIG. 6 is a bottom elevation view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines illustrate portions of the desk lamp that form no part of the claimed design. 

CLAIM The ornamental design for the desk lamp, as shown and described. 